CN100459284C

CN100459284C - Antenna device

Info

Publication number: CN100459284C
Application number: CNB038128152A
Authority: CN
Inventors: C·G·布洛姆
Original assignee: POELOS AB
Current assignee: POELOS AB; Perlos AB
Priority date: 2002-04-09
Filing date: 2003-04-02
Publication date: 2009-02-04
Anticipated expiration: 2023-04-02
Also published as: CN101388485B; DE10392530T5; AU2003217131A1; CN1659741A; CN101388485A; SE521833C2; SE0201083L; WO2003088414A1; SE0201083D0

Abstract

A broad band antenna has a radiator, for example a slot (4) in an earth plane (3). A supply means (6) has a first central conductor (9) which, with one end (10), is connected to the circuits in a transceiver which extends along/in association with the radiator (4) and which has one free end (11). The supply means (6) further has a second, helical conductor (13) whose one end (14) is earthed and whose other end (15) terminates freely. The helical conductor (13) surrounds the central conductor (9). In one embodiment, the helical conductor (13) is provided with straight, mutually intersecting conductor sections on opposing sides of a three-layer circuit card. The opposing ends of the conductor sections are electrically connected to one another through the circuit card, and the central conductor (9) is disposed in the central layer of the card.

Description

Antenna assembly

Technical field

The present invention relates to a kind of antenna assembly with big bandwidth, this antenna assembly comprises radiator and the feeder equipment that links to each other with circuit in the radio communication equipment.The invention still further relates to a kind of feeder equipment that is used for the broadband feed of radiator.

The invention still further relates to a kind of feeder equipment, it comprises carrier and a plurality of conductive layer of electric insulation and nonmagnetic substance, this carrier has vertically, wherein first side of carrier has a plurality of with this vertical angulation 180-α and by its first conductor part in two, and second side of carrier has a plurality of and second conductor part this vertical angulation α, the opposite end of first conductor part is positioned to align with the respective end of second conductor part, and the end of the mutual alignment of first and second conductor parts is electrically connected each other.

Background technology

The so-called cell phone in transceiver in the radio communication equipment, this day normal open words or the connection impedance of mobile phone are in 50 ohm the scope usually, and according to the design and the type of radiator, the variation of its impedance may be very big, for example in the scope of 20-500 ohm.Like this, must carry out the adaptive of impedance.

In prior art constructions, normally build the adaptation network of discrete component, these discrete components are usually placed on the circuit board of mobile phone.Even the impedance in this structure is an acceptable, this structure also can cause higher cost usually, and has bigger loss.In addition, can't be easily in conjunction with this class adaptation network in the antenna structure that is suitable for, owing to will obtain simple and compact design and structure, this suitable antenna structure is essential.

Patent SE-C2-504342 discloses a kind of adapter network and antenna, and wherein adapter network can low-loss mode be worked.In its simplest form, this network is made up of thin insulated conductor, and this Wire-wound has on the earth brace of certain diameter.By suitably selecting the spacing of the number of turn, shank diameter and each circle, just can realize being better than the adapter network of simple π network.

Though above-mentioned adapter network has many advantages with relevant antenna, yet they can not provide the antenna assembly in broadband, it is suitable for about 1.7 to 2.6GHz frequency range under the situation of single distributing point.Comprise further that also it is impossible can keeping single distributing point simultaneously in GSM bandwidth, the possibility of promptly working under about 900MHz.

Owing to be to be in the prerequisite that the filter technology in the R﹠D process is used at present, therefore use single distributing point can bring very big benefit.In addition, use single distributing point external antenna easy to use.

Summary of the invention

An object of the present invention is to design a kind of as the described antenna assembly that can overcome the prior art defective of foreword.Specifically, an object of the present invention is to design a kind of can be at the frequency range of non-constant width, the antenna assembly of promptly in from about 1.7GHz to about 2.6GHz scope, working, and can be provided at the possibility of work in GSM and the GPS bandwidth.Another object of the present invention is to realize a kind of antenna assembly, and it can be economical and reasonably creates, and very little to the demand of free space.

Another object of the present invention is that design is a kind of as the described feeder equipment that can overcome the prior art defective of foreword, it can be worked well with the radiator of multiple any design, irrelevant with the detailed structure of these radiators, and the manufacturing of this feeder equipment is simple and economical.

The purpose that has constituted basis of the present invention is realized as the described antenna assembly of foreword by a kind of, it is characterized in that, feeder equipment comprises first conductor with first and second ends on the one hand, wherein a) first conductor dbus is crossed its first end and is linked to each other with circuit in the radio communication equipment, b) first conductor and radiator near and along its extension, c) first conductor and radiator are non-electric-connecting, feeder equipment comprises second conductor with first and second ends on the other hand, second conductor dbus is crossed its first end and is linked to each other with ground, and described second conductor along at least a portion longitudinal extent of described first conductor and three-dimension type ground around or surround described first conductor, perhaps extend around described first conductor.

The purpose that has constituted basis of the present invention is realized by a kind of feeder equipment, it is characterized in that, the 3rd elongated conductor part extends along the longitudinal, and it is that electricity is discrete with respect to first and second conductor parts, and is arranged between first conductor and second conductor.

Description of drawings

Come to introduce in further detail the present invention below with reference to accompanying drawings.In the accompanying drawings:

Fig. 1 has shown the circuit board that is included in so-called cell phone or the mobile phone, wherein is combined with according to antenna assembly of the present invention;

Fig. 2 has shown the figure that measures according to the measurement result of mounted cast gained of the present invention, and working range clearly illustrates and be about 900MHz that the wideband operation scope is near the centre frequency of about 2.2GHz;

Fig. 3 has shown a part of circuit board that has the slot aerial that designs according to the present invention;

Fig. 4 has shown a kind of coupling selection that is used to slot aerial feed shown in Figure 3;

Fig. 5 has shown the second coupling selection that is used to slot aerial feed shown in Figure 3;

Fig. 6 has shown a practical embodiment of feeder equipment, and it also is shown among Fig. 1; With

Fig. 7 is the decomposition view of feeder equipment shown in Figure 6.

Embodiment

In Fig. 1, label 1 relates to the circuit board that for example can be contained in cell phone or the mobile phone.Circuit board 1 is made up of the carrier 2 of at least one dielectric material and the metal coating of one deck at least 3 that is coated at least on its upper side.Yet circuit board can be by corresponding to the multilayer conductive layer of metal coating 3 and place a plurality of layers, sheet or the plate of the dielectric material between these conductive layers to form.Be provided with radiator on circuit board 1, it can be the type of choosing wantonly.In the embodiment shown, as example, this radiator is shown as quarter-wave slot radiator.Radiator or slot 4 realize that by removing metal coating 3 from the both sides of carrier 2 slot can see through radiation like this.Can be clear from figure, slot 4 has opening 5, and as mentioned above, it can be set at the quarter-wave low-resonance.Radiator also can be a half wave radiator, and in the example of slot radiator, it requires slot more longer, and without any the counterpart corresponding to opening 5; Like this, slot will seal and form half wave radiator.Also can consider the radiator of other type.

For to the radiator feed, in the example of above-mentioned quarter-wave slot 4, used the feeder equipment 6 that will be explained in greater detail below.Feeder equipment 6 can be unit independently, so just it can be installed in a certain distance from radiator 4 for the position, yet it also can be integrally or partly is integrated in the circuit board 1.Between feeder equipment 6 and radiator 4, there is not electrical connection.

Surpassing a radiator if desired, can be to be provided with on the same metal coating 3 to surpass a radiator at same ground plane according to the present invention.In using the example of slot radiator, even two slots are arranged in physically close mutually, they can not produce mutual film yet and ring.Like this, surpass a slot by using, just can realize the antenna of multiband according to the present invention, wherein each frequency band all has big bandwidth.

By locating slot by different way, for example by with they vertically be arranged to mutually vertically, also can influence radiation mode, make the radiation lobe difference of these two radiators.For example, if slot is arranged to make it vertically for approximate horizontal, its radiation lobe will be a vertical orientation so, and this is a very big advantage in GPS equipment.Similarly, if slot have vertical vertically, radiation lobe will be substantially horizontal so.

Metal coating 3 also can be arranged on the shell of mobile phone, all can on the Decorative shell of inner support shell and outside.In the above-mentioned example that has a slot radiator, also it can be arranged on the shell.

In the example with quarter-wave slot radiator 4 according to Fig. 1, radiator and feeder equipment 6 or exciter all have vertically, and these are vertically parallel each other.Yet,, these vertically mutual shapes are had a certain degree for the reason that is provided with or finely tunes.Therefore, for the same purpose, can change the distance between radiator 4 and the exciter 6.Even radiator has the design different with the slot 4 shown in above-mentioned illustrative purpose, it all is suitable for.

Fig. 3 has shown according to antenna assembly of the present invention with the schematic form of simplifying.Except orientation, this antenna assembly is in function aspects and shown in Figure 1 identical.

Therefore, Fig. 3 has shown ground plane 3, and it is made up of the metal level on the suitable carrier of the nonmagnetic substance that is positioned at insulation, metal forming etc., and this carrier for example is the metallized area in circuit board or the mobile phone outer casing.Similar with the embodiment among Fig. 1, in ground plane 3, be provided with the slot 7 of being with openend 8.So just slot can be arranged in the quarter-wave low-resonance, wherein the length of slot has determined relevant wavelength.

Even physical size is bigger, the present invention also can both comprise half-wavelength resonator, and slot 7 will be longer in this embodiment this moment, and in closed at both ends.

In Fig. 3, slot 7 comes feed by exciter or feeder equipment 6, and feeder equipment 6 comprises first conductor or the center conductor 9 with first end 10 and the second end 11.In this practical embodiment, first conductor 9 can be made of a part of center conductor in the coaxial cable 12, and the other end (not shown) of coaxial cable 12 links to each other with circuit in the mobile phone that includes this antenna assembly.

Feeder equipment 6 also comprises second conductor 13 with first end 14 and the second end 15.The first end 14 of second conductor 13 links to each other with shielded conductor or earthing conductor 16 in the coaxial cable 12, and the second end 15 then terminates in cecum.Second conductor 13 also can link to each other with ground plane 3, and comes ground connection by its first end 14.

In the embodiment shown, second conductor 13 is spiral physical form, and therefore, it is in the zone that has on its at least a portion longitudinal extent on the not ipsilateral that alternately is positioned at first conductor 9.Therefore, the helicoid or second conductor 13 with three-dimension type ground around, surround first conductor 9, perhaps extend around first conductor 9.This also is applicable among the following improved embodiment.Helicoid can be shorter than second conductor, perhaps equally grows (Fig. 3), perhaps than longer (Figure 4 and 5) with it.

First conductor 9 be positioned at slot 7 vertically on, be in the ground plane 3 or parallel with it.Between first conductor 9 and second conductor 13, do not electrically contact, except first end 14 ground connection of second conductor, do not electrically contact between the metal in second conductor 13 and ground plane 3 yet.Distance between first conductor 9 and the ground plane (if first conductor is not positioned on the ground plane) has determined the connection degree between first conductor 9 and the slot 7.

Second conductor 13 has formed the inductance that distributes along the longitudinal extent of first conductor 9.In addition, second conductor 13 has formed electric capacity between himself and first conductor 9, and this electric capacity also is that the length along first conductor 9 distributes.In addition, between the tight adjacent circle of second conductor, also have electric capacity.

In the antenna assembly according to Fig. 3, the length of slot 7 has determined the center of the resonance range that antenna assembly is worked within it.The length of the center conductor or first conductor 9 is suitable for the length of slot.Yet the length of first conductor 9 is not crucial especially, and only needing to be long to provide the space to get final product for the essential number of turn of second conductor 13.

Utilize design shown in Figure 3, antenna assembly just will have the broadband resonance range shown in arrow A among Fig. 2.

Can be clear from Fig. 3, the

second end

11 and 15 of first conductor 9 and second conductor 13 is positioned at respectively from coaxial cable 12 and is the position of roughly the same distance.In this embodiment, in Fig. 2, there is not formant B.On the other hand, if second conductor 13 extends to such an extent that make its second end 15 surpass the second end 11 of first conductor, for example shown in Figure 4 and 5, second conductor 13 this " extra length " can provide second resonance zone of antenna assembly so, and this resonance zone is shown in the arrow B among Fig. 2.Like this, utilize second conductor 13 of elongation just can realize a kind of like this antenna assembly, it has the arrowband resonance zone under the GSM frequency on the one hand, and has the broad band region in the 1.7-2.6GHz scope on the other hand.

Under the condition that does not influence broad band region A (Fig. 2), low-frequency resonance peak B is moved.If the free end 15 of second conductor 13 links to each other with ground (Fig. 4) by electric capacity, this means that so formant B will be towards lower frequency shifts.In Fig. 4,, therefore can change the size of the second end 15 and the electric capacity between the ground of second conductor 13 step by step because some electric capacity 17,18 are coupled together by switch 19.

In the embodiment according to Fig. 5, the second end 15 of second conductor 13 links to each other with electric capacity 32, and the other end of electric capacity 32 links to each other with variable capacitance diode 20 on the one hand, links to each other with resistance 21 on the other hand.The other end of resistance links to each other with control input end 22, and links to each other with ground by electric capacity 23.By changing the voltage between ground and the control input end 22, just can infinitely change the electric capacity of variable capacitance diode, thereby also change the position of the formant B among Fig. 2.

If the feeder equipment among Fig. 4 embodiment 6 is designed to independent unit, so switch 19 and electric capacity 17 and 18 (perhaps can more electric capacity) being also included within this unit is to be well suited for.In this case, switch 19 can be so-called MEMS.

If the feeder equipment among Fig. 5 embodiment 6 is designed to independent unit, electric capacity 32, resistance 21, variable capacitance diode 20 and electric capacity 23 is also included within this unit is well suited for so.

Fig. 6 and 7 has shown a kind of feeder equipment that is used for the radiator of slot 4 shown in Figure 1 or other design is carried out feed or excitation.In this embodiment, feeder equipment 6 forms independent unit, but also can integrally or partly be integrated in the circuit board shown in Figure 11 as described above.

According to the present invention, also can be on the one hand with suitable feeder equipment, the suitable radiator with optional type is integrated in the unit on the other hand.

First chip component 25 and second chip component 24 that comprise dielectric material according to the feeder equipment of Fig. 6 and 7.Upper side at the second dielectric material element 24 is provided with a plurality of conductor parts 26, and it is straight basically and is parallel to each other, and is arranged to spaced apart relation a little.Conductor part 26 and the longitudinal centre line angulation α that passes feeder equipment 6.Opposed end place at these conductor parts 26 is provided with through hole 27, and their purpose will be described in more detail below.Also be provided with the coupling part 28 that has through hole 29 in addition, and the conductor part 26 of being arranged to the most close coupling part 28 has coupling part 40.

On the first dielectric material element 25, its on the side of the second dielectric material element 24, be provided with Fig. 3 in first conductor, 9 corresponding first conductor or center conductors 30, this conductor 30 is that first end 10 places have coupling part 31 and through hole 36 at the one end, and coupling part 31 is corresponding to the coupling part 28 on the second dielectric material element.Opposite side in Fig. 7 promptly is provided with a plurality of conductor parts 33 on the downside of the first dielectric material element 25, is equipped with through hole 34 at the opposed end place of these conductor parts.Conductor part 33 and the longitudinal centre line that passes feeder equipment 6 have formed the angle of 180-α.Therefore, conductor part 33 will intersect or intersect with conductor part 26.At last, be arranged to have coupling part 41 away from the conductor part 33 of coupling part 31.With these two

elements

24,25 link up and by

hole

27,34,29 and 36 when welding or electroplating, so just can obtain having the feeder equipment of the center conductor or first conductor 30, this conductor 30 is centered on or is wrapped in one " flat wound ", and this spiral divides formation by

conductor part

26,33 and by the plated portions that runs through in above-mentioned hole.In fact, first conductor 30 should closely center on or wrap in this " flat wound " as much as possible, and therefore, the length of

conductor part

26,33 is less than the length shown in the figure.

As a kind of alternative of described embodiment, can form by three different dielectric material elements according to the feeder equipment of Fig. 6, wherein each element all has conductive layer, therefrom can form

conductor part

26,30 and 33.

In recent years, technology has developed into and can realize three-dimensional conductive profile in the inside of the continuous element of a dielectric material.This technology can be used to produce feeder equipment shown in Figure 6.Feeder equipment can adopt this technology, it more approaches the embodiment shown in Fig. 3 to 5 with regard to structure, wherein can be round than flat cross section corresponding to the counterpart (conductor 9 among Fig. 3) of conductor 30, and helicoid can be cylindrical, taper or " circle ".

In Fig. 6 of the feeder equipment 6 that has shown such formation, used from the label among Fig. 3, therefore, the similitude between these two kinds of structures is conspicuous.

Having a plurality of being used in Fig. 1 is connected to contact on the circuit board 1 with feeder equipment 6.Specifically, have the coupling part 37 (

label

28 and 31 of Fig. 7) on the first end 10 that is used for being connected to first conductor 9, also be useful on the coupling part 38 (coupling part 40 among Fig. 7) on the first end 14 that is connected to second conductor 13 in addition, and be used for being connected to the coupling part 39 (coupling part 41 of Fig. 7) on the second end 15 of second conductor 13.

In the above-described embodiments, ground plane 3 and feeder equipment 6 are on the substantially the same plane.Some conductor parts in the feeder equipment 6, the

conductor part

26,30 among for example Fig. 7 also can be arranged in the circuit board 1.Perhaps, the ifs circuit plate has several layers, whole feeder equipment 6 can be integrated in the circuit board so, and the form of radiator with metallization pattern is arranged on the shell of mobile phone.

In another embodiment of metal level 3 employing plating forms and at radiator, adopt among another embodiment of metallization pattern, if plating is not a coating, but adopt grid, grid or grid configuration, this is beneficial for production technology so, and wherein " size of mesh opening " has relation slightly with relevant wavelength.

In the above-described embodiments, first conductor 9 is shown as straight conductor.Yet this structure is not necessary, first conductor can be the conductor that wriggles, the conductor of zigzag, the conductor of waveform or the conductor of other structure are as long as its second conductor has on the not ipsilateral that alternately is arranged in first conductor or centers on the part that first conductor is provided with.

Claims

1. antenna assembly with big bandwidth, comprise radiator (4,7) with the feeder equipment (6) that links to each other with circuit in the radio communication equipment, it is characterized in that, described feeder equipment (6) comprises on the one hand first conductor (9) of have first end (10) and the second end (11), described first conductor (9,30)

A) link to each other with circuit in the radio communication equipment by its first end (10),

B) with described radiator (4,7) near and along its extension,

It is c) non-electric-connecting with described radiator,

On the other hand, described feeder equipment comprises second conductor (13 of have first end (14) and the second end (15); 26,33), described second conductor dbus is crossed its first end (14) and is linked to each other with ground, and described second conductor is along described first conductor (9,30) at least a portion longitudinal extent and three-dimension type ground around or surround described first conductor (9,30), perhaps extend around described first conductor (9,30).

2. antenna assembly according to claim 1 is characterized in that, described second conductor (13; 26,33) the second end (15) terminates in cecum.

3. antenna assembly according to claim 1 is characterized in that, the second end (15) of described second conductor (13) links to each other with ground by the electric capacity (17,18,20,32) of gradable formula or continous way variation.

4. according to each described antenna assembly in the claim 1 to 3, it is characterized in that described radiator (4,7) is the slot (4,7) that is configured in the conductive earthing face (3) of general plane; First conductor (9,30) has straight basically part, and described straight basically part is positioned at described slot and substantially parallel with described ground plane (3), or is arranged in described ground plane (3).

5. according to each described antenna assembly in the claim 1 to 3, it is characterized in that described radiator (4,7) is the slot in the conductive earthing face (3), the center line on described slot has vertically; The described longitudinal centre line of distance that described first conductor (9,30) is positioned at outside the described slot is the position of certain distance, and substantially parallel with described longitudinal centre line.

6. according to each described antenna assembly in the claim 1 to 3, it is characterized in that described radiator is arranged on the metallization pattern on the shell of radio communication equipment.

7. according to the antenna assembly described in the claim 6, it is characterized in that it is first vertical that described feeder equipment (6) has; It is second vertical that described radiator has; Described first vertically vertically intersects with second.

8. according to each described antenna assembly in the claim 1 to 3, it is characterized in that described radiator (4,7) is the slot in the conduction plating on the shell of radio communication equipment.

9. the antenna assembly described in according to Claim 8 is characterized in that, it is first vertical that described feeder equipment (6) has; It is second vertical that described slot (4,7) has; Described first vertically vertically intersects with second.

10. antenna assembly according to claim 4 is characterized in that, described ground plane is to have grid or cancellated non-coating.

11. antenna assembly according to claim 6 is characterized in that, described metallization pattern is to have grid or cancellated non-coating.

12. antenna assembly according to claim 8 is characterized in that, described plating is to have grid or cancellated non-coating.

13., it is characterized in that the second end (11) of described first conductor (9,30) extends out and surpasses the second end (15) of described second conductor (13) according to each described antenna assembly in the claim 1 to 3.

14., it is characterized in that the second end (11) of described first conductor (9,30) is positioned in the first end (14) and the zone between the second end (15) of second conductor (13) according to each described antenna assembly in the claim 1 to 3.

15., it is characterized in that described second conductor (13 according to each described antenna assembly in the claim 1 to 3; 26,33) the second end (15) extends out and surpasses the second end (11) of described first conductor (9).